Sonya Collier

Saint James School Of Medicine, Park Ridge, Illinois, United States

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Publications (3)8.32 Total impact

  • [show abstract] [hide abstract]
    ABSTRACT: Heightened inflammatory activity has been proposed as a mechanism for the development of cancer-related fatigue (CRF), a common and distressing condition that can negatively affect quality of life. Inflammation is also implicated in the pathogenesis of depression, and depression is a strong predictor of CRF. Thus, the role of the pro-inflammatory cytokine network in CRF may be mediated by depression or both conditions may share similar underlying physiological processes. The current study investigated associations between fatigue, depression and inflammatory cytokine (IFN-γ, IL-6, TNF-α) and CRP concentrations, as well as kynurenine pathway (KP) activation, in 61 breast cancer patients prior to chemotherapy. Changes in inflammatory markers and KP activation over time were also explored, and associations with changes in fatigue and depression were examined. Higher levels of CRP were significantly correlated with fatigue and depression before chemotherapy; nevertheless, CRP predicted fatigue independently of depression. Although greater kynurenine concentrations were associated with increased immune activation, there was no evidence that the KP played a role in fatigue or depression. Furthermore, no relationships emerged between either fatigue or depression and IFN-γ, IL-6, or TNF-α before chemotherapy. Nevertheless, kynurenine levels pre- and post- treatment significantly predicted changes in depression, suggesting that heightened KP activation may contribute to depressive symptoms in patients treated for cancer. In addition, IL-6 significantly covaried with fatigue. These preliminary findings provide some support for the idea that low-grade inflammation contributes to the development of CRF, independently of depression; however, there was no evidence that this is mediated by KP activity.
    Brain Behavior and Immunity 08/2013; · 5.61 Impact Factor
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    ABSTRACT: Fatigue is a debilitating and common condition in cancer patients. This study examined pretreatment predictors of fatigue before chemotherapy and also assessed whether these could prospectively predict fatigue posttreatment. A total of 100 patients completed questionnaires assessing psychological factors, physical activity and sleep. A subsample of 26 participants wore actigraphs to objectively assess sleep/wake and activity/rest. Fatigue was measured pretreatment and posttreatment and at follow-up several months later. Greater pretreatment pain, depression, stress and sleep disruption significantly predicted greater fatigue before chemotherapy, explaining 55 percent of the variance. Pretreatment fatigue significantly predicted posttreatment fatigue. No other significant prospective predictors of posttreatment fatigue emerged.
    Journal of Health Psychology 03/2013; · 1.22 Impact Factor
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    ABSTRACT: Cancer-related fatigue (CRF) is a common and distressing side-effect of cancer treatment. The present study developed a brief version of the Illness Perception Questionnaire (IPQ) for assessing patients' representations of CRF. Cancer patients and survivors (n = 155) completed a revised version of the IPQ as well as measures of fatigue severity at two different time-points. Confirmatory factor analysis at both Time 1 and 2 showed that the seven-factor solution based on the Self-Regulation Model fit the data adequately and factorial invariance over the two time-points was supported. The resulting subscales exhibited good internal consistency and test-retest reliability. The adapted version of the IPQ shows promise for the assessment of patient perceptions regarding CRF. The scale may be able to be used clinically to identify if patients have inaccurate or unhelpful representations of CRF and to help tailor interventions for persistent fatigue in cancer survivors.
    Journal of Clinical Psychology in Medical Settings 04/2012; 19(3):293-307. · 1.49 Impact Factor